Granted Patent
Utility
US 4,238,028 · App. 05/819,736
Flight conveyor
Inventor:
Robert C. Lake
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jul 28, 1977
Inventor
Robert C. Lake
Assignee (at issue)
Joy Manufacturing Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.